STM32F4 DISCOVEY board power supply

Bettysoe227

Hi!
i want to supply voltage for STM32F407 board using a lipo battery(14.8V (4S), 5500mA / h, 50C) via a regulator voltage.
i want to know the most suitable regulator voltage which supports the power supplied by the battery? and there are any other methods to stabilize this voltage without using a regulator ?